Dude.
“Not all of those people were neo-Nazis, believe me. Not all of those people were white supremacists by any stretch.”
This quote is correct only insofar as some of them were KKK members and some were white nationalists. Technically his statement is true if at least one of them isn't a complete piece of shit, but the problem with this statement is that he's offering an excuse for the 99% who are.
“What about the alt-left that came charging at, as you say, at the alt-right? Do they have any semblance of guilt?”
Moral equivalence. It sucked when Obama did it, and it sucks now. Saying "what about the other guys" does nothing to excuse the fact that we're talking about people who openly embrace the eradication of non-whites. But that's what he's doing here.
The voters who share his views is obviously not 0.001% of this country's population, as evidenced by how many people here are willing to offer excuses for what happened and for how Trump has addressed the issue.